Looking Glass, a revolutionary window manager revealed in 2006

I recently redescovered the keynote video in which Looking Glass was announced and realized it’s now 12 years old. I remember watching this video in awe and still today I findit quite remarkable although a bit gimmicky.

https://youtu.be/JXv8VlpoK_g

I wonder what was the motivation behind this project and why it never really took off. Also what are the people behind it up to nowadays - does anyone here know the backstory to this?